bolt-on
bolt-on · bolt-ons
An accessory that can be bolted on or otherwise attachedAn accessory that can be bolted on or otherwise attached.
UK/bəʊlt ˈɒn/US/ˌbolt ˈɔn/
Meaning
3 senses(also, figuratively)An accessory that can be bolted on or otherwise attached.
(figuratively)A functionality or service that can be added to an existing arrangement or plan (for example, a mobile telephone subscription).
(plural, slang)A breast implant.